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3 years ago

Four multiple choice science questions.

Physics

2 answers:

mixas84 [53]3 years ago

7 0

A
c
a
c
just from memory hope this helps

Sati [7]3 years ago

4 0

1. Jupiter (being the largest planet and all)
2. Ice and Rock
3. None of the above
4. Uranus

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When air expands adiabatically (without gaining or losing heat), its pressure P and volume V are related by the equation PV1.4=C

DiKsa [7]

Answer:

$\frac{dV}{dt}=21.21cm^3/min$

Explanation:

We are given that

$PV^{1.4}=C$

Where C=Constant

$\frac{dP}{dt}=-7KPa/minute$

V=420 cubic cm and P=99KPa

We have to find the rate at which the volume increasing at this instant.

Differentiate w.r.t t

$V^{1.4}\frac{dP}{dt}+1.4V^{0.4}P\frac{dV}{dt}=0$

Substitute the values

$(420)^{1.4}\times (-7)+1.4(420)^{0.4}(99)\frac{dV}{dt}=0$

$1.4(420)^{0.4}(99)\frac{dV}{dt}=(420)^{1.4}\times (7)$

$\frac{dV}{dt}=\frac{(420)^{1.4}\times (7)}{1.4(420)^{0.4}(99)}$

$\frac{dV}{dt}=21.21cm^3/min$

5 0

3 years ago

Read 2 more answers

Scientific work is currently underway to determine whether weak oscillating magnetic fields can affect human health. For example

nlexa [21]

Answer:

The maximum emf that can be generated around the perimeter of a cell in this field is $1.5732*10^{-11}V$

Explanation:

To solve this problem it is necessary to apply the concepts on maximum electromotive force.

For definition we know that

$\epsilon_{max} = NBA\omega$

Where,

N= Number of turns of the coil

B = Magnetic field

$\omega =$ Angular velocity

A = Cross-sectional Area

Angular velocity according kinematics equations is:

$\omega = 2\pi f$

$\omega = 2\pi*61.5$

$\omega =123\pi rad/s$

Replacing at the equation our values given we have that

$\epsilon_{max} = NBA\omega$

$\epsilon_{max} = NB(\pi (\frac{d}{2})^2)\omega$

$\epsilon_{max} = (1)(1*10^{-3})(\pi (\frac{7.2*10^{-6}}{2})^2)(123\pi)$

$\epsilon_{max} = 1.5732*10^{-11}V$

Therefore the maximum emf that can be generated around the perimeter of a cell in this field is $1.5732*10^{-11}V$

6 0

3 years ago

A car drives around a horizontal, circular track at constant speed. Consider the following three forces that act on the car: (1)

DiKsa [7]

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2 years ago

What is the momentum of a 546,540 kg train that is travelling at 7.8 m/s

lara [203]

p=mv so wouldn't u multiply them?

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2 years ago

Mathew throws a ball straight up in the air. it rises for a period of time and then begins to drop. At which points in the balls

Allushta [10]

Answer: The greatest force of gravity on the ball will occur at the point when the ball is near to hit the ground ... hope this helps have a good day :P

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2 years ago